2003 Yukon Problem

[Nyjetfan21]

I have a 2003 Yukon 5.3 L engine. I originally had a couple of Engine codes . One of the codes were a bad O2 sensor bank one sensor one so I change that sensor and the other code was multiple misfire so I did a tuneup I put all new AC Delco platinum plugs and AC Delco wires . After I did all that my truck is idling very low . So I read a few things online and I decided to clean the throttlebody with throttlebody cleaner I wiped it all out and now the truck is idling even worse very shaky . I drive it and the engine light is on and blinks about 20 to 30 times and then stay solid every minute also what can I do to solve this issue

 

[Doubeleive]

for starters I would double check all your work, make sure you didn't leave the maf unplugged or something of that nature, make sure the intake is installed properly and that no air is leaking from somewhere

 

[Nyjetfan21]

I did recheck all my work. I never unplugged the maf, I cleaned the throttle body without removing it. I also disconnected the negitive battery terminal when I cleaned the throttle body. It seems like everytime I disconnect the battery is when the engine light returns .

 

[HiHoeSilver]

I did recheck all my work. I never unplugged the maf, I cleaned the throttle body without removing it. I also disconnected the negitive battery terminal when I cleaned the throttle body. It seems like everytime I disconnect the battery is when the engine light returns .

FLASHING CEL is no good. Pull and post the code(s).

Did you move the throttle plate while cleaning the body?

Have your ever cleaned your MAF?

 

[Nyjetfan21]

Yes i moved the throttle body so i can get my fingers in there to clean it and i havent cleaned the mass air flow in at least 10 years

 

[HiHoeSilver]

Yes i moved the throttle body so i can get my fingers in there to clean it and i havent cleaned the mass air flow in at least 10 years

Codes?

Clean the MAF. Only use MAF cleaner. Make sure the plugs on it and the throttle body are seated well and report back.

If you moved the plate anything other than ultra gentle like, it may take a while for your truck to relearn the idle. Take a look at the throttle % while you have the scanner on there getting the codes.

The are a couple idle relearn procedures you can try without a tech2, but they are hit or miss it seems.

 

[Nyjetfan21]

Ok ty I’ll get back to you guys later when I get home from work and I can scan the truck

 

[Erickk120]

Flashing CEL = missfires, check which cylinders are the culprit and go from there, but yeah codes would help out.

 

[Nyjetfan21]

I got home a little late last night from work and on my way home from work the truck seem to be running fine engine light was not flashing anymore but I did have a steady engine light that stays on I was too tired to do anything when I got home. This morning on my way to work the truck was running fine and the engine light went off as I was pulling up to work. I’m going to give it a few days I think everything reset it self and hopefully the computer learned everything I did to the truck. I will post back within the week to let you guys know if I have any more trouble or if engine light comes back on. Unless anyone has other suggestions I should do. Thank you to everyone for the great support.

 

[Nyjetfan21]

I’m just leaving work and my engine light is on but I still have great power in the truck with no hesitation maybe my engine light didn’t go off and I thought it did

 

[HiHoeSilver]

I’m just leaving work and my engine light is on but I still have great power in the truck with no hesitation maybe my engine light didn’t go off and I thought it did

Get the code. How's the idle now?

 

[Nyjetfan21]

I finally had the chance to scan the codes and I got the same two codes P134 and P300. I already installed AC Delco platinum plugs and wires and also changed the O2 Sensor bank 1 sensor 1. I never cleared the code after I changed the plugs and wires. Here are the picture of the scan codes that I got.

 

[Nyjetfan21]

I finally had the chance to scan the codes and I got the same two codes P134 and P300. I already installed AC Delco platinum plugs and wires and also changed the O2 Sensor bank 1 sensor 1. I never cleared the code after I changed the plugs and wires. Here are the picture of the scan codes that I got. I also got a code P1133 now. I did clear all the codes this morning as well. Any help would be great thank you

 

[SnowDrifter]

That's upstream - senses air/fuel ratio and *can* cause your misfire.

Pull plug on oxygen sensor and check resistance on the pinouts. Hopefully someone can post specs on that, I'm walking out the door right now

 

[HiHoeSilver]

You never cleared the code so the light never went away? Start by clearing it and see if it comes back. You may have already fixed it.

 

[Nyjetfan21]

OK thank you I’ll let you guys know tomorrow or Thursday if the engine light comes back on after driving it . That should hopefully be enough driving for the light to pop back on, but hopefully it dont

 

[SnowDrifter]

Ohhh I misunderstood. Thought you were still getting codes after doing the work.

Yeah clear codes and just drive it. You can scan again to see if there are any pending codes - items that the vehicle is picking up on but hasn't yet met the threshold to throw a MIL

 

[Nyjetfan21]

Its been 3 days since I cleared the engine light and it popped back on last night. I rescanned it today and I got only 2 codes now instead of 3 codes. The codes I have are the same as above. Here is A pic of codes. I stated in a previous post I already changed the O2 sensor. I did buy a really cheap one online for 13.00. Any suggestions would be great. Ty

 

[Nyjetfan21]

Sorry i uploaded the pic to many times

 

[HiHoeSilver]

Sorry i uploaded the pic to many times

Sensor is a dud or you have a wiring problem. You can either do some diagnostics with a voltmeter, or switch the sensors between bank 1 and 2 and see if the problem follows the sensor or stays on bank 1.